/*
 * Ultimate Booking Manager — Frontend Styles
 * Phase 1: Foundation & Premium Frontend
 * No external libraries. No frameworks. Pure CSS3.
 */

/* ============ DESIGN TOKENS ============ */
.ubm-wrapper {
	--ubm-radius-sm: 8px;
	--ubm-radius-md: 14px;
	--ubm-radius-lg: 20px;
	--ubm-transition: 180ms cubic-bezier(0.4, 0, 0.2, 1);

	--ubm-accent: #6153F5;
	--ubm-accent-hover: #4E3FE0;
	--ubm-accent-soft: #EEEBFF;

	--ubm-bg: #F6F7FB;
	--ubm-surface: #FFFFFF;
	--ubm-surface-alt: #FAFAFD;
	--ubm-border: #E7E8F0;
	--ubm-text: #1A1B25;
	--ubm-text-muted: #6B6E85;
	--ubm-text-faint: #A2A4B5;

	--ubm-success: #1FAA6D;
	--ubm-success-soft: #E7F8F0;
	--ubm-danger: #E5484D;
	--ubm-danger-soft: #FDECEC;

	--ubm-shadow-sm: 0 1px 2px rgba(20, 20, 43, 0.04);
	--ubm-shadow-md: 0 8px 24px rgba(20, 20, 43, 0.08);
	--ubm-shadow-lg: 0 20px 48px rgba(20, 20, 43, 0.12);

	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	color: var(--ubm-text);
	box-sizing: border-box;
}

.ubm-wrapper[data-theme="dark"] {
	--ubm-accent: #8A7CFF;
	--ubm-accent-hover: #9C90FF;
	--ubm-accent-soft: #2A2550;

	--ubm-bg: #121319;
	--ubm-surface: #1B1D27;
	--ubm-surface-alt: #21232F;
	--ubm-border: #2E303E;
	--ubm-text: #F1F1F6;
	--ubm-text-muted: #A6A8BC;
	--ubm-text-faint: #6D6F82;

	--ubm-success: #34C98A;
	--ubm-success-soft: #17281F;
	--ubm-danger: #F16B70;
	--ubm-danger-soft: #2E1A1B;

	--ubm-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
	--ubm-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
	--ubm-shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.45);
}

.ubm-wrapper *,
.ubm-wrapper *::before,
.ubm-wrapper *::after {
	box-sizing: border-box;
}

/* ============ LAYOUT ============ */
.ubm-container {
	max-width: 980px;
	margin: 0 auto;
	padding: 32px 20px 60px;
}

.ubm-visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	overflow: hidden;
	clip: rect(0 0 0 0);
	white-space: nowrap;
}

/* ============ HEADER ============ */
.ubm-header {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	gap: 16px;
	margin-bottom: 28px;
}

.ubm-title {
	font-size: 28px;
	font-weight: 700;
	line-height: 1.25;
	margin: 0 0 6px;
	letter-spacing: -0.02em;
}

.ubm-subtitle {
	font-size: 15px;
	color: var(--ubm-text-muted);
	margin: 0;
}

.ubm-theme-toggle {
	position: relative;
	width: 44px;
	height: 44px;
	flex-shrink: 0;
	border-radius: 50%;
	border: 1px solid var(--ubm-border);
	background: var(--ubm-surface);
	color: var(--ubm-text);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	box-shadow: var(--ubm-shadow-sm);
	transition: transform var(--ubm-transition), box-shadow var(--ubm-transition), background var(--ubm-transition);
}

.ubm-theme-toggle:hover {
	transform: translateY(-2px);
	box-shadow: var(--ubm-shadow-md);
}

.ubm-theme-toggle:focus-visible {
	outline: 2px solid var(--ubm-accent);
	outline-offset: 2px;
}

.ubm-theme-icon {
	position: absolute;
	display: flex;
	transition: opacity var(--ubm-transition), transform var(--ubm-transition);
}

.ubm-theme-icon--moon { opacity: 0; transform: scale(0.6) rotate(-40deg); }
.ubm-theme-icon--sun { opacity: 1; transform: scale(1) rotate(0deg); }

.ubm-wrapper[data-theme="dark"] .ubm-theme-icon--sun { opacity: 0; transform: scale(0.6) rotate(40deg); }
.ubm-wrapper[data-theme="dark"] .ubm-theme-icon--moon { opacity: 1; transform: scale(1) rotate(0deg); }

/* ============ CARD ============ */
.ubm-card {
	background: var(--ubm-surface);
	border: 1px solid var(--ubm-border);
	border-radius: var(--ubm-radius-lg);
	box-shadow: var(--ubm-shadow-lg);
	padding: 28px;
	animation: ubm-fade-up 420ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes ubm-fade-up {
	from { opacity: 0; transform: translateY(14px); }
	to { opacity: 1; transform: translateY(0); }
}

/* ============ STEPS ============ */
.ubm-steps {
	display: flex;
	align-items: center;
	margin-bottom: 28px;
	padding-bottom: 24px;
	border-bottom: 1px solid var(--ubm-border);
}

.ubm-step {
	display: flex;
	align-items: center;
	gap: 10px;
	opacity: 0.45;
	transition: opacity var(--ubm-transition);
}

.ubm-step.is-active,
.ubm-step.is-complete {
	opacity: 1;
}

.ubm-step-number {
	width: 28px;
	height: 28px;
	border-radius: 50%;
	background: var(--ubm-surface-alt);
	border: 1.5px solid var(--ubm-border);
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 13px;
	font-weight: 600;
	flex-shrink: 0;
	transition: background var(--ubm-transition), border-color var(--ubm-transition), color var(--ubm-transition);
}

.ubm-step.is-active .ubm-step-number {
	background: var(--ubm-accent);
	border-color: var(--ubm-accent);
	color: #fff;
}

.ubm-step.is-complete .ubm-step-number {
	background: var(--ubm-success);
	border-color: var(--ubm-success);
	color: #fff;
}

.ubm-step-label {
	font-size: 13px;
	font-weight: 600;
	white-space: nowrap;
}

.ubm-step-line {
	flex: 1;
	height: 1px;
	background: var(--ubm-border);
	margin: 0 14px;
}

/* ============ PANELS ============ */
.ubm-panel {
	animation: ubm-fade-in 260ms ease;
}

@keyframes ubm-fade-in {
	from { opacity: 0; }
	to { opacity: 1; }
}

.ubm-grid-2 {
	display: grid;
	grid-template-columns: 1.1fr 1fr;
	gap: 28px;
}

.ubm-panel-subheading {
	font-size: 14px;
	font-weight: 700;
	margin: 0 0 14px;
	display: flex;
	align-items: center;
	gap: 8px;
	flex-wrap: wrap;
}

.ubm-selected-date-label {
	font-weight: 500;
	color: var(--ubm-accent);
	font-size: 13px;
}

/* ============ CALENDAR ============ */
.ubm-calendar-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	margin-bottom: 16px;
}

.ubm-cal-month-label {
	font-weight: 700;
	font-size: 15px;
}

.ubm-cal-nav {
	width: 34px;
	height: 34px;
	border-radius: 50%;
	border: 1px solid var(--ubm-border);
	background: var(--ubm-surface-alt);
	color: var(--ubm-text);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: background var(--ubm-transition), transform var(--ubm-transition);
}

.ubm-cal-nav:hover {
	background: var(--ubm-accent-soft);
	color: var(--ubm-accent);
	transform: scale(1.06);
}

.ubm-cal-nav:focus-visible,
.ubm-day:focus-visible,
.ubm-timeslot:focus-visible,
.ubm-btn:focus-visible,
.ubm-field input:focus-visible,
.ubm-field select:focus-visible,
.ubm-field textarea:focus-visible {
	outline: 2px solid var(--ubm-accent);
	outline-offset: 2px;
}

.ubm-calendar-weekdays {
	display: grid;
	grid-template-columns: repeat(7, 1fr);
	margin-bottom: 6px;
}

.ubm-weekday {
	text-align: center;
	font-size: 11px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.04em;
	color: var(--ubm-text-faint);
	padding: 6px 0;
}

.ubm-calendar-grid {
	display: grid;
	grid-template-columns: repeat(7, 1fr);
	gap: 4px;
}

.ubm-day {
	position: relative;
	aspect-ratio: 1 / 1;
	border: none;
	background: transparent;
	border-radius: var(--ubm-radius-sm);
	font-size: 13px;
	font-weight: 500;
	color: var(--ubm-text);
	cursor: pointer;
	transition: background var(--ubm-transition), color var(--ubm-transition), transform var(--ubm-transition);
}

.ubm-day:hover:not(:disabled) {
	background: var(--ubm-accent-soft);
	color: var(--ubm-accent);
	transform: translateY(-1px);
}

.ubm-day.is-outside {
	color: var(--ubm-text-faint);
	opacity: 0.35;
}

.ubm-day:disabled {
	cursor: not-allowed;
}

.ubm-day.is-weekend {
	color: var(--ubm-text-muted);
}

.ubm-day.is-today {
	box-shadow: inset 0 0 0 1.5px var(--ubm-accent);
	font-weight: 700;
}

.ubm-day.is-selected {
	background: var(--ubm-accent);
	color: #fff;
	font-weight: 700;
	box-shadow: 0 4px 12px rgba(97, 83, 245, 0.35);
}

.ubm-calendar-legend {
	display: flex;
	gap: 14px;
	margin-top: 16px;
	flex-wrap: wrap;
}

.ubm-legend-item {
	display: flex;
	align-items: center;
	gap: 6px;
	font-size: 11px;
	color: var(--ubm-text-muted);
}

.ubm-legend-dot {
	width: 8px;
	height: 8px;
	border-radius: 50%;
}

.ubm-legend-dot--today { box-shadow: inset 0 0 0 1.5px var(--ubm-accent); }
.ubm-legend-dot--selected { background: var(--ubm-accent); }
.ubm-legend-dot--disabled { background: var(--ubm-text-faint); opacity: 0.5; }

/* ============ TIME SLOTS ============ */
.ubm-timeslot-placeholder {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	text-align: center;
	gap: 10px;
	padding: 40px 16px;
	color: var(--ubm-text-faint);
	background: var(--ubm-surface-alt);
	border: 1px dashed var(--ubm-border);
	border-radius: var(--ubm-radius-md);
}

.ubm-timeslot-placeholder p {
	margin: 0;
	font-size: 13px;
}

.ubm-timeslot-grid {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 8px;
	margin-bottom: 18px;
}

.ubm-timeslot {
	padding: 12px 10px;
	border-radius: var(--ubm-radius-sm);
	border: 1px solid var(--ubm-border);
	background: var(--ubm-surface-alt);
	color: var(--ubm-text);
	font-size: 13px;
	font-weight: 600;
	cursor: pointer;
	transition: background var(--ubm-transition), color var(--ubm-transition), border-color var(--ubm-transition), transform var(--ubm-transition);
}

.ubm-timeslot:hover:not(:disabled) {
	border-color: var(--ubm-accent);
	color: var(--ubm-accent);
	transform: translateY(-1px);
}

.ubm-timeslot.is-selected {
	background: var(--ubm-accent);
	border-color: var(--ubm-accent);
	color: #fff;
	box-shadow: 0 4px 12px rgba(97, 83, 245, 0.3);
}

.ubm-timeslot:disabled {
	opacity: 0.4;
	cursor: not-allowed;
	text-decoration: line-through;
}

/* ============ BUTTONS ============ */
.ubm-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: 13px 22px;
	border-radius: var(--ubm-radius-sm);
	font-size: 14px;
	font-weight: 700;
	border: 1px solid transparent;
	cursor: pointer;
	transition: background var(--ubm-transition), transform var(--ubm-transition), box-shadow var(--ubm-transition), opacity var(--ubm-transition);
}

.ubm-btn-block { width: 100%; }

.ubm-btn-primary {
	background: var(--ubm-accent);
	color: #fff;
	box-shadow: 0 6px 16px rgba(97, 83, 245, 0.3);
}

.ubm-btn-primary:hover:not(:disabled) {
	background: var(--ubm-accent-hover);
	transform: translateY(-1px);
	box-shadow: 0 10px 22px rgba(97, 83, 245, 0.38);
}

.ubm-btn-primary:disabled {
	opacity: 0.45;
	cursor: not-allowed;
	box-shadow: none;
}

.ubm-btn-secondary {
	background: var(--ubm-surface-alt);
	color: var(--ubm-text);
	border-color: var(--ubm-border);
}

.ubm-btn-secondary:hover {
	background: var(--ubm-border);
	transform: translateY(-1px);
}

.ubm-link-btn {
	background: none;
	border: none;
	color: var(--ubm-accent);
	font-size: 12px;
	font-weight: 700;
	cursor: pointer;
	text-decoration: underline;
	padding: 0;
	margin-left: auto;
}

/* ============ SUMMARY ============ */
.ubm-selection-summary {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 12px 16px;
	background: var(--ubm-accent-soft);
	color: var(--ubm-accent);
	border-radius: var(--ubm-radius-sm);
	font-size: 13px;
	font-weight: 600;
	margin-bottom: 22px;
}

/* ============ FORM ============ */
.ubm-form-row {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 16px;
}

.ubm-field {
	margin-bottom: 18px;
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.ubm-field label {
	font-size: 13px;
	font-weight: 700;
	color: var(--ubm-text);
}

.ubm-required {
	color: var(--ubm-danger);
}

.ubm-field input,
.ubm-field select,
.ubm-field textarea {
	font-family: inherit;
	font-size: 14px;
	padding: 12px 14px;
	border-radius: var(--ubm-radius-sm);
	border: 1px solid var(--ubm-border);
	background: var(--ubm-surface-alt);
	color: var(--ubm-text);
	transition: border-color var(--ubm-transition), box-shadow var(--ubm-transition);
	width: 100%;
}

.ubm-field input:hover,
.ubm-field select:hover,
.ubm-field textarea:hover {
	border-color: var(--ubm-text-faint);
}

.ubm-field input:focus,
.ubm-field select:focus,
.ubm-field textarea:focus {
	border-color: var(--ubm-accent);
	box-shadow: 0 0 0 3px var(--ubm-accent-soft);
}

.ubm-field textarea {
	resize: vertical;
	min-height: 96px;
}

.ubm-field.has-error input,
.ubm-field.has-error select,
.ubm-field.has-error textarea {
	border-color: var(--ubm-danger);
}

.ubm-field-error {
	font-size: 12px;
	font-weight: 600;
	color: var(--ubm-danger);
	min-height: 16px;
	display: block;
}

.ubm-form-actions {
	display: flex;
	justify-content: space-between;
	gap: 12px;
	margin-top: 10px;
}

.ubm-form-alert {
	display: flex;
	align-items: flex-start;
	gap: 10px;
	padding: 12px 14px;
	border-radius: var(--ubm-radius-sm);
	background: var(--ubm-danger-soft);
	color: var(--ubm-danger);
	font-size: 13px;
	font-weight: 600;
	margin-bottom: 18px;
}

.ubm-btn[aria-busy="true"] {
	opacity: 0.75;
	cursor: progress;
}

/* ============ CONFIRMATION ============ */
.ubm-confirmation {
	text-align: center;
	padding: 30px 10px 10px;
	display: flex;
	flex-direction: column;
	align-items: center;
}

.ubm-confirmation-icon {
	width: 76px;
	height: 76px;
	border-radius: 50%;
	background: var(--ubm-success-soft);
	color: var(--ubm-success);
	display: flex;
	align-items: center;
	justify-content: center;
	margin-bottom: 18px;
	animation: ubm-pop 420ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes ubm-pop {
	0% { transform: scale(0.5); opacity: 0; }
	100% { transform: scale(1); opacity: 1; }
}

.ubm-confirmation-title {
	font-size: 22px;
	font-weight: 700;
	margin: 0 0 8px;
}

.ubm-confirmation-text {
	color: var(--ubm-text-muted);
	font-size: 14px;
	max-width: 380px;
	margin: 0 0 22px;
}

.ubm-confirmation-details {
	width: 100%;
	max-width: 380px;
	background: var(--ubm-surface-alt);
	border: 1px solid var(--ubm-border);
	border-radius: var(--ubm-radius-md);
	padding: 16px;
	margin-bottom: 22px;
	text-align: left;
	font-size: 13px;
}

.ubm-confirmation-row {
	display: flex;
	justify-content: space-between;
	padding: 6px 0;
	border-bottom: 1px solid var(--ubm-border);
}

.ubm-confirmation-row:last-child { border-bottom: none; }

.ubm-confirmation-row span:first-child {
	color: var(--ubm-text-muted);
}

.ubm-confirmation-row span:last-child {
	font-weight: 700;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
	.ubm-grid-2 {
		grid-template-columns: 1fr;
	}
}

@media (max-width: 640px) {
	.ubm-container { padding: 20px 14px 40px; }
	.ubm-card { padding: 18px; border-radius: var(--ubm-radius-md); }
	.ubm-title { font-size: 22px; }
	.ubm-form-row { grid-template-columns: 1fr; }
	.ubm-step-label { display: none; }
	.ubm-steps { justify-content: space-between; }
	.ubm-timeslot-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 400px) {
	.ubm-timeslot-grid { grid-template-columns: 1fr 1fr; }
}

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce) {
	.ubm-wrapper *,
	.ubm-wrapper *::before,
	.ubm-wrapper *::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
	}
}